There is described a packaging assembly (1) configured to form and seal a plurality of packs (3) for containing a pourable food product starting from a tube (2) of packaging material; the packaging assembly (1) comprises a pair of tracks (6a, 6b) and at least a pair of moving elements (7a, 7b; 7a', 7b'; 7a", 7b"), which are cyclically movable along the tracks (6a, 6b), respectively; each moving element (7a, 7b; 7a', 7b'; 7a", 7b") comprises one forming unit (18a, 18b; 18a', 18b'; 18a", 18b") configured to cooperate with the tube (2) so as to surround a portion of the tube (2) destined to form a main portion (3a) of one respective pack (3); and one sealing unit (19a, 19b; 19a', 19b'; 19a", 19b") configured to cooperate with the tube (2) to sequentially seal the tube (2) at predetermined consecutive cross sections, each pair of consecutive cross sections forming opposite sealing bands (3b) of one respective pack (3); each forming unit (18a, 18b; 18a', 18b'; 18a", 18b'') is mounted onto the respective moving element (7a, 7b; 7a', 7b'; 7a", 7b") in a linearly movable manner towards and away from the sealing unit (19a, 19b; 19a', 19b'; 19a", 19b") mounted onto the same moving element (7a, 7b; 7a', 7b'; 7a" , 7b").